<template>
    <div class="todo-footer" v-show="total">
        <label>
            <!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
            <input type="checkbox" v-model="isAll"/>
        </label>
        <span>
            <span>已完成{{ todoTotal }}</span> / 全部{{ total }}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
    </div>
</template>

<script>
export default {
  name: 'TodoFooter',
  props: ['todoArr', 'checkTodoAll', 'clearAllTodo'],
  computed: {
    total () {
      return this.todoArr.length
    },
    todoTotal () {
      return this.todoArr.filter(item => item.done).length
    },
    isAll: {
      get () {
        return this.todoTotal === this.total && this.total > 0
      },
      set (val) {
        this.checkTodoAll(val)
      }
    }
  },
  methods: {
    clearAll () {
      if (confirm('是否删除已选中的任务？')) {
        this.clearAllTodo()
      }
    }
  }
}
</script>

<style scoped>
/*footer*/
.todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
}

.todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
}

.todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
}

.todo-footer button {
    float: right;
    margin-top: 5px;
}
</style>
